Abstract
Clematis marmoraria B. V. Sneddon sp. nov. from amongst marble rocks near the summit of Hoary Head, northern Arthur Range, is described and illustrated; it is a low-growing crevice plant with non-twining, variously dissected leaves and solitary, white unisexual flowers. Recent collections from a little-visited peak in North-west Nelson include an undescribed species of Clematis. Plants have been studied in the field and in cultivation in Wellington where transplants were grown in an unheated glasshouse from 1971 to 1974. The foHowing description and measurements are based on wild plants, fresh, liquid-preserved, and pressed. Specimens are deposited in the herbaria of Botany Division, DSIR (CHR) and Victoria University of Wellington (WELTU).

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